Pipe-joint.



@Ui/Mpman F. N. URONHOLM.

PIPE JOINT.

APPLICATION FILED MAY 8,1911.

1,048,045 v PatentedDeo. 24, ,1912:

if ooo 'upooo ooo TTED STATES -PATENT ormoni.V

FREDERCK N. CRONHOLM, `Oil? SUNNYSIDE, WASHINGTON.

PIPE-JOINT.

speeincanoneof Letters Patent.k Patented Dee. 24, 1912.

Application also May s, 191i. serial No. 625,683.

To all whom it may concern.'

-Be it known that I, FREDERICK N. CRON- HoLM, a' citizen of the United States, residing at Sunnyside, in the .county of `Yakima and State of Washington, have invented a new and useful `Pipe-Joint,V of which the following is a specification.

This invent-.ion has reference tol improve-v ments in pipe joints and more particularly with reference to concrete pi Jes,and its ob- `iect is to'provide a means w ereby lengths of concrete pipes maybe joined end to'eud without requiring interior `retinishing and, moreover, providing means whereby rthe.

Joint is made stronger than joints as usually constructed.

The present'invention is particularly useful in'connection with pipes of diameters which will not permit the entrance of a workman for the purpose of smoothing the joints, this being necessary Vin conduits made of concrete pipe sections united by cement mixtures'in vthe ordinary method of laying concrete conduits, since the cement mipture, used forvunitiug the ends of thepips is; liable to flow into the interior of the pipe, thereby making such portion of the pipe oi irregular diameter, and to` such extent interfering with the dow of material through the pip. L

In accordance with the present invention the pipe sections are made of the same eX- ternal diameter throughout .as is customary in the manufacture ot'v concrete pipes'fand one end rp yeaclipipeis madeof greater in# ternal diameterfora distance by the int-roduction of a suitableform in .the mold,

while the other end of the pipe carries an internal ring firmly er'nbedded inthe corresponding end of the pipe and projecting -V therefrom axially for a sufficient distance to cover the portion-of larger diameter in the end of t'he'niating pipe seetionythe ringy constituting an' internal- Adamr ywhich will hold `the cementlng 'mixture introduced be- `tweeuthe abutting ends-of the pipes and by making the ring Lof suitable form it is' an# chored not only to the end 'of the section initially carrying it, but to the end of the section into which itis-introduced.

The invention will be best .understood from a. yconsideration of the following detailed description taken in connection with the accompanying drawings, with the understanding, however, that while. the ldrawings show different practical embodiments ments of the invention, since the latter is.

susceptible of various changes and modifications without departure from the scope of the invention. l

In the drawings Figure 1 is an axial diametric ysection of4 a concrete pipe made up of sections, two sections lbeing shown in joined relation and another section in posi- Y tion to be joined to asection. Fig. 2 is a cross section on the line 2-2 of Fig. l. Fig. 3 is an axial section through a form of joint differing somewhat from that shown in Fig. 1. Fig. .4 is a section on the line 4-4 of Fig. 3.

Referring to the drawings, there are shown pipe sections 1 made of concrete, which sections may be formed in a suitable mold, andcach section is provided at one end with an internal annular recess 2 which,

because o i' this recess, may be termed thev bell end, although the external diameter of ,the pipe is not enlarged at this point, and the bell end is not designed to receive the` corresponding end of another pipe section,v

since in accordance with the present invention the pipe sections .are brought into close end to end relation, but with a small space between the ends which is finally filled with a cementii'ig mixture of suitable richness. The end of the pipe remote from the bell end carries a ring 3 in the structure shown in Figs. 1 and 2, or 3a inthe structure shown Ain Figs. 3 and 4, the rings differing in certain details, pose. The corresponding'cnd of the pipe 1 when the latter is formed, the ring being introduced into the Amold before the concrete mixture is placed therein, and when the but not in general form or purring `3 or?)a isr molded into the opncrete mixturehas set thering is embe'ddecL therein with the inner face of the ring-flush with the inner face of the-pipe, so as to present no impediment to thepassage of material through the pipe since the diameter of the latter is not in any manner -reduced bythe presence of the ring. Such ring or band is made of any suitable non-corrosive metal and projects axially from the corresponding end of the concrete-pipe section to an extent equal or about equal to theraxial depth of the groove i2 in the end of afmating section. bedded to halt its length inthe pipe carrying it.

ln l and 2 the baud'is indicated as n. piece ont sheet metal bent into cylindrical .shape with the ends overlapping und riveted together, the joint beingF shown nt 4 but such bund muy be an endless bund, indi-' cated in Figs. 3 and et, that is, a bund withn out e riveted or like joint. In Figs; 1 and 2 the band 3 is shown us'provided with numerous indentetions 5 which may be mede by a. suitable tool or tools punching through the bund from the inner Woll outwardly either before or after the bend is completed, und these punchingsnrc so formed :is not to remove any of the metal, but'siinply produce outwardly directed ours 6, the purpose oi these ours being to embed in the concrete or cement mixtures to anchor the band against movement with relation to such materiels.

lig's. 3 und 4i the bend is formed with circuniferentiei grooves onV the inner fece forming; like bends 7 on the outer face, which fece is the one contacting with the pipe or cementing materiel. in cithei1 cese the inner Well of the band is Without 'uutcrial projection to enter into the interio of the iinished pipe, and so obstruct the iiow of materiel therethrough` The ends ot the pipe sections have their end faces in planes perpendicular to the longitudinal exis of the pisfe, so that when the ends of the pipe nre y irought into contiguity, these faces will be in substantiel parallelism one with thc other, although not coi'itncting since it is desirable that u. thin layer of cementing material he confined b. weon the adjacent ends of the tnl unite them and prevent leuks-ge tiroir 'he ioln'ts. When the adjacent ends of the pipes are brought into the desired ciosereletion, thetree ends of the bends 3 or 3, cose may be, enter the bell ends of the adjoining pipes to en extent substantiully that of the axial length of the groove 2, so thct'there is formed in the bell end of each. pipe en annuler chamber between the outer well of the project-ing end ci the bend and the inner weli of the pipe 4Where there is formed the gmove 2. The 'projecting ends of the bands src sufficiently longer than the axial depth of the grooves 2 to provide for the thin circumferential space between the contiguous ends of the ipe sections wheny the free ends of the han s abut against the inner end wells of the grooves. To unite the edjoinin ends o' contiguous pipe sections e suitfiile quantity ed 'eementing niaterial 8 is `first n plied tothe projecting portion of the bang 3 of 'one of the pipe sections. rIhis ccmenting materiel is usually formed of a. mixture'rch in cement and may be so prepared. as to be suciently cohesive to cause it to retain its place upon the band 3 in u manner somewhat es illustrated et the right hund end oir Fig. i.. The pipe section cnil containing the hand. 3 und cement 8 applied thereto is now introduced into the i l weones recess 2 of the adjacent pipe section until the free end of the bend 3 is approximately or quite at .the inner end of the recess. Since the ccmcnt mixtlvire is still somewhat soft it will readily conform to the space between the band 3 end the walls of the recess 92 and fill such space, some of `the materiel finding its Way into the spacebetweeri the contigo ous ends ofthe two sections being united. The band 3 or 3, however, prevents dow of this cementing mixture into the interior 'of the pipe, even though the pcrforations 5 be present, since these latter areV too constrieteti 'topermit any material flow of the cementing mixture therethrough. When the free end of the bend has entered the heil. end of the next section in the full extent, the chenr ber defined by the groove 2 and' therorrespending bund hecomcs filled with the soft material and the space between the contiguons lends of the pipe sections also becomes filled with this material which may be stiff enough to hold its place, but still sutlicientl soft to flow to an extent permitting the fil 'larg of the space between the pipes, and when this material burdens the band is anchored both to *he pipo originally carrying it and the adjoining pipe into which it is introduced5 while the cemcnting material also serves unite the mating ends of the pipe sections. The interior of the pipe wl'ien the sections ere joined is Without constriction et thejoints, since the bends have the seme `internal diameter as the Pipe, and consequently the Walls of the pipe nre flush throughout.

The bands may bc made of gaivzmized iron or stoet or be otherwise protected against corrosion and avoid the necessity of wiping the inside of the pipe st the joints,

while thorough inspection ot' the joints is permitted un no collez' 'is necessary. Furthermore, the pipes may be broughtinto such close relation end to end as 4to muito the pipe iine prccticcily monolithic. Since e rich mixture of the ingredients, richer than used in .the body of' the pipe sections, is employed in the ioint, the'joints ere as strong as the remainder of the pipe. Since the joint structure of the present invention may be readily und thoroughly inspected it is en easyA metter to ascertain Whether the 'joints are satisfactory, for it is easily oscer tained Whether the yoints Aere as strong es other-parts of 'the pipe, and this is the cri teri'on for the passing on the job as satisfectory.

In joining small pipes` diiiiculty has hexetofore been encountered in endeavoring to apply the mortar to the end of the pipe, beceuso some oi. the mortar would almost invurisbiy full of?, und it is always diiiicult to ascertain Whether or not the mortar really stayed in the ioint or any part fell. into the .piper The holding means on exterior los of the projecting end ofthe band, especially Where theband is of the perforated type, is e'eotlvein preventing any of the cementing material or mortar rom falling o", even .faiihould the ipe be turned upside down, and, moreover, t e pipe sections may be brought iit/e closer relation tiifrnheretefore, thus rec quit-ing esineller amount of -eenienting ninterial. Sonie of this materiel will usually 10 ooze out forming' e bead on the ontel' surface of the pipe, 'which muy afterward be rubbed ofi? leaving -tlie joint complete and the pipe.

25 wall thereof with its.y inner surface flush with said well and projcciingirom the end of the pipe sectionT :ind the other end of seid pipefsection being' provided with n groove or channel in its inner wail oi less 0 aerial length than end. adapted to receive the projecting portion of n bend o-i n suc-- lceesive pipe Section,v the outer diameter of l thenieteliic band one end of the pipe section being less than the inner diameter of thepipe section. 1

2; A concrete pipe section heving et; one end an interior entering groove or channel tlie groove or channel at the other end of and. at the other end provided with e metalf i `lic band with anchoring-means extending ontwerdly from its outer wall, the external diameter of the band and its anchoring menne being lees than the interna-l diameter of the groove or channel et the other end of the pipe section, and said metallic bend being at one end embedded in the inner wall ot' the correspondingend of the pipe sect/ionr with its inner surface flush with the said inner. Well end its other end projecting beyond the end of the pipe section carrying it, the extent of axial projection of the metallic band being greater than the axial exten?J of the entering groovel or channel'et the other end of the pipe section.' p

3. A concrete pipe sect-ion havin et one lend u metallic bend embedded in t 1e inner wall thereof finsii with seid Wall and projecting'iom the end of the pipev and there provided with exterior anchoring menne, end the other end of the pipe being provided with :1 groove or channel in its inner Well adapted to receive the projecting portion o n bund of e Successive pipe section in substantially concentric spaced relation to 'the Iwills: oi' sind jroove5 the projecting end of the bend being' of e length to enter the groove of the successive pipe section to the 'full :mini length of seid groove.

ln icetinoni'y that l claim the foregoing ne my own, I. lmic hereto affixed my Signe.-

nre in the presence oi two Witnesses.

Fnigppin'ci'n."ioiinnomr Vitn'esses y Jenn J. Boon, D. S'i'mfnn. 

